Question

The following is not drawn to scale. Find the area of the circle. (Use 22/7 as an approximation for 1.)21 CMWhat is the area of the circle? Round to one decimal place.Do not include units, cm?, in your answer.

Answer 1

The diameter of the circle is d = 21 cm.

The formula for the area of circle is,

$A=\frac{\pi(d)^2}{4}$

Determine the area of circle of diameter 21 cm.

$\begin{gathered} A=\frac{\pi(21)^2}{4} \\ =\frac{22}{7}\cdot\frac{21}{4}\cdot21 \\ =11\cdot\frac{3}{2}\cdot21 \\ =346.5 \end{gathered}$

Thus area of circle is 346.5.